Finite element simulation of WC-Co coating sprayed on the surface of hot rolling pinch-roll

In this study optimal thickness of WC-Co spray coating by HVOF (High Velocity Oxy Fuel) method on the surface of hot rolling pinch-roll roller by utilizing finite element method were investigated. The task of pinch-roll was to get and guide sheets toward the coilers. The working environment of these components was acidic and they worked in temperature and humid ambient. The surface of these rollers was worn due to impact and movement of sheet on it. At first, the critical condition of pinch-roll was determined. Results showed that working condition of the pinch-roll at the initial impact was worse than other working times. Also hard and thin sheets made the more critical condition. After the surface of pinch-roll was coated analysis showed that deformation and failure were created in coating. In this condition the best thickness of coating was about 600 microns that caused minimum shear stress distribution both in the surface coating and in the interface of coating/substrate.